With this ingeniously designed Ubrace piece, mounting an outdoor umbrella on top of one of of our picnic tables is simple. Normally these umbrellas require a heavy ground base to hold them steadily in place. However, these bases do not allow the umbrellas to be mounted directly above picnic tables, which is often where they are the most needed. The Ubrace eliminates the need for these bases and allows the umbrella to be mounted directly in the middle of your table. The sturdy aluminum collar is simply fastened around the umbrella pole beneath the table, preventing it from moving around or being easily pulled up. Its versatile structure fits any of our umbrellas with 1.5-inch poles, including the Market Style and Patio Style designs. Its durable stainless steel fasteners firmly hold it in place for plenty of strength, even in high winds.